Anamorphic Projection Lens Groups for Non-Rotational Screen Curvature
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing projection systems struggle to maintain high image formation performance when projecting images on non-rotationally symmetrical surfaces, as the image formation position varies depending on the position on the screen, leading to inconsistent image quality.
Innovation Solution
A projection system comprising lens groups with anamorphic lenses having different curvatures in the meridian and sagittal directions, where the second lens group is movable between the first and third lens groups, allowing adjustable field curvature without changing the light flux size or angle of incidence, and including afocal systems to control the aspect ratio and curvature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional projection system projects on a non-rotationally symmetrical surface, then the projection can be performed on various screen shapes, but the image formation position varies depending on the position on the screen, resulting in inconsistent image quality
Solution Approach 1:
The projection lens is divided into multiple lens groups (first, second, third lens groups) with different powers. The second lens group with opposite power can be moved independently between the first and third lens groups, allowing separate control of field curvature in different directions (meridian and sagittal), thereby maintaining image quality across non-rotationally symmetrical surfaces
Solution Approach 2:
The second lens group is designed to be movable along the optical axis between the first and third lens groups. This dynamic adjustment capability allows the field curvature to be changed in response to different screen shapes, enabling the system to adapt to various projection surfaces while maintaining consistent image formation performance
2Manufacturing precision
If the image formation position is adjusted for different screen positions, then image quality can be improved, but the system complexity increases due to multiple adjustment mechanisms
Solution Approach 1:
The movable second lens group serves multiple functions simultaneously: it adjusts field curvature, corrects aberrations, and adapts to different screen geometries. This single multi-functional mechanism replaces what would otherwise require multiple separate adjustment systems, maintaining simplicity while achieving comprehensive image quality optimization
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enables high image formation performance over entire images on surfaces with varying curvatures, maintaining consistent image quality by adjusting field curvature and suppressing aberrations, even on non-rotationally symmetrical surfaces.
Implementation Method 1
lens groups each formed of anamorphic lenses having curvature of a meridian surface and curvature of a sagittal surface (sagittal cross sectional) different from each other
Data Source
AI summary
First to third lens groups that are formed of anamorphic lenses having positive power and anamorphic lenses having negative power combined with one another and allow the distances between the anamorphic lenses to be changed cooperate with one another to allow field curvature to be changed both in the meridian direction and the sagittal direction.